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From an Octakis(3‐cyanopropyl)silsesquioxane Building Block to a Highly COOH‐Functionalized Hybrid Organic–Inorganic Material
Author(s) -
Boullanger Arnaud,
Gracy Guillaume,
Bibent Nicolas,
DevautourVinot Sabine,
Clément Sébastien,
Mehdi Ahmad
Publication year - 2012
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201101037
Subject(s) - silsesquioxane , chemistry , thermogravimetric analysis , hybrid material , polymer chemistry , hydrogen bond , fourier transform infrared spectroscopy , elemental analysis , infrared spectroscopy , chemical engineering , inorganic chemistry , polymer , organic chemistry , molecule , engineering
Abstract A new nanostructured and highly COOH‐functionalized hybrid organic–inorganic material has been synthesized by the hydrolysis of oligomeric octahedral silsesquioxane (POSS), which contains eight cyanopropyl groups. The hybrid, elemental building block oligomeric octakis(3‐cyanopropyl)silsesquioxane ( CN‐POSS ) was synthesized from oligomeric octakis(3‐chloropropyl)silsesquioxane ( Cl‐POSS ) by an exchange reaction. The formation and nanostructuration of the COOH‐functionalized hybrid material were induced by noncovalent hydrogen bonding between COOH‐POSS units without decomposition of the core. The material has been fully characterized by scanning electron microscopy, FTIR and 1 H, 13 C, and 29 Si solid‐state NMR spectroscopy, X‐ray diffraction, and elemental analysis, which confirm that the POSS core remains intact after each chemical modification step. Thermogravimetric analysis indicates that the organic units are thermally stable up to 200 °C. The activation energy related to the proton conductivity of COOH‐POSS has been evaluated and confirms the presence of strong hydrogen bonds. Finally, the accessibility and adsorption capacity of the COOH groups towards transition metal ions have been demonstrated and underline the potential of these hybrid materials in extraction chemistry.